Liquid-helium-free persistent-mode HTS magnets for NMR and MRI applications

适用于 NMR 和 MRI 应用的无液氦持久模式 HTS 磁体

• 批准号: 9094257
• 负责人: Yukikazu Iwasa
• 金额: $ 18.15万
• 依托单位: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
• 依托单位国家: 美国
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9094257
• 关键词: Achievement; Bathing; Budgets; Clinical Services; Development; Devices; Diagnostic; Eating; Equipment; Evaluation; Exploratory/Developmental Grant; Gases; Goals; Helium; High temperature of physical object; Industry; International; Joints; Korea; Lead; Liquid substance; Magnetic Resonance Imaging; Manufacturer Name; Measures; Mechanics; Methods; Nitrogen; Output; Patients; Performance; Power Sources; Price; Private Sector; Privatization; RNA Splicing; Recording of previous events; Reporting; Research; Research Personnel; Resistance; Scientist; Site; Solid; Structure; Techniques; Technology; Test Result; Time; Universities; cold temperature; cryogenics; design; design and construction; driving force; new technology; next generation; operation; programs; public health relevance; superconductivity; symposium; wound

 DESCRIPTION (provided by applicant): The global helium (He) shortage is now one of the most pressing challenges for superconducting NMR/MRI magnets, both for manufacturers and users. In the last decade, helium price has quadrupled and the rise is expected to accelerate as the US Federal Helium Reserve rapidly depletes. The on-going liquid helium (LHe) crisis makes it urgent, and imperative than ever, to develop LHe-free NMR/MRI magnets, for which HTS has a definite and overwhelming edge over LTS. However, there is a critical technology that has yet been applied to the HTS magnet: persistent-mode operation that requires superconducting HTS-HTS joints in the magnet. In 2013, our collaborators, Korea University and SuperMag Inc., reported a fabrication method and successful test results of an REBCO- REBCO superconducting joint, for the first time in magnet technology history, at the 23rd International Magnet Technology Conference. This REBCO-REBCO joint, measured in a bath of liquid nitrogen (LN2) at 77 K, has a resistance of <10-15 Ω, sufficiently small for persistent-mode NMR and MRI magnets. As the first step toward developing the next-generation, LHe-free, persistent-mode HTS NMR/MRI magnets, this 2-year R21 program applies this outstanding splicing achievement to build and operate the first-ever persistent-mode HTS magnets wound with REBCO tape. Two specific aims of this 2-year program are to: 1) design and build two LHe-free, persistent-mode REBCO magnets of two relevant sizes, an 83-mm/2.35-T for NMR and a 500-mm/0.1-T for MRI; and 2) operate the two magnets, first in LN2 at 77 K and next in solid nitrogen (SN2) in the range 10-30 K. The main focus of the program is to develop "practical" solutions for persistent-mode operation of HTS NMR/MRI magnet that can be operated under a solid cryogen (LHe-free) condition. We strongly believe that both LHe-free and persistent-mode features will make the HTS magnet an indispensable option in the next-generation NMR/MRI magnets. Successful completion of this 2-year R21 program will result in further development of key technologies for manufacturing LHe-free, persistent-mode HTS NMR/MRI magnets that have never been available to date. Undoubtedly, it will push forward the state-of-the-art HTS magnet technology, to the next level. Ultimately, this new technology will lead to affordable NMR magnets for research and economical diagnostic MRI magnets that benefit more people.

 描述（由申请人提供）：全球氦（He）短缺现在是超导NMR/MRI磁体最紧迫的挑战之一，无论是对于制造商还是用户。在过去的十年中，氦的价格已经翻了两番，随着美国联邦氦储备的迅速耗尽，预计价格还会加速上涨。持续的液氦（LHe）危机使得开发无LHe NMR/MRI磁体比以往任何时候都更加紧迫和必要，其中HTS具有明显的压倒性优势。然而，有一项关键技术尚未应用于HTS磁体：持续模式操作，需要磁体中的超导HTS-HTS接头。2013年，我们的合作伙伴高丽大学和SuperMag Inc.，在第23届国际磁体技术会议上，在磁体技术史上首次报道了REBCO- REBCO超导接头的制造方法和成功的测试结果。在77 K的液氮（LN 2）浴中测量的这种REBCO-REBCO接头具有<10-15 Ω的电阻，对于持续模式NMR和MRI磁体来说足够小。作为开发下一代不含LHe的持久模式HTS NMR/MRI磁体的第一步，这个为期2年的R21计划将这一杰出的拼接成就应用于构建和操作有史以来第一个用REBCO胶带缠绕的持久模式HTS磁体。这个为期2年的计划的两个具体目标是：1）设计和建造两个相关尺寸的无LHe，持续模式REBCO磁体，用于NMR的83-mm/2.35-T和用于MRI的500-mm/0.1-T;和2）操作这两个磁体，首先在77 K的液氮中，然后在10-30 K的固体氮（SN 2）中。该计划的主要重点是为HTS NMR/MRI磁体的持续模式操作开发“实用”解决方案，该磁体可以在固体制冷剂（无LHe）条件下操作。我们坚信，无LHe和持续模式的特性将使HTS磁体成为下一代NMR/MRI磁体中不可或缺的选择。这项为期2年的R21计划的成功完成将导致制造无LHe，持久模式HTS NMR/MRI磁体的关键技术的进一步发展。毫无疑问，它将推动国家的最先进的高温超导磁体技术，到一个新的水平。最终，这项新技术将导致负担得起的核磁共振磁体的研究和经济的诊断磁共振磁体，使更多的人受益。